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Merge pull request #487 from chriseth/sol_arbitraryEvaluationOrder

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Evaluate expressions in convenient order.
This commit is contained in:
Gav Wood 2014-11-08 18:10:18 +00:00
commit dded93e31d
1 changed files with 21 additions and 34 deletions
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55
ExpressionCompiler.cpp
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@ -48,21 +48,15 @@ bool ExpressionCompiler::visit(Assignment& _assignment)
{
m_currentLValue = nullptr;
Expression& rightHandSide = _assignment.getRightHandSide();
rightHandSide.accept(*this);
Type const& resultType = *_assignment.getType();
appendTypeConversion(*rightHandSide.getType(), resultType);
_assignment.getRightHandSide().accept(*this);
appendTypeConversion(*_assignment.getRightHandSide().getType(), *_assignment.getType());
_assignment.getLeftHandSide().accept(*this);
Token::Value op = _assignment.getAssignmentOperator();
if (op != Token::ASSIGN)
{
// compound assignment
m_context << eth::Instruction::SWAP1;
appendOrdinaryBinaryOperatorCode(Token::AssignmentToBinaryOp(op), resultType);
}
if (op != Token::ASSIGN) // compound assignment
appendOrdinaryBinaryOperatorCode(Token::AssignmentToBinaryOp(op), *_assignment.getType());
else
m_context << eth::Instruction::POP; //@todo do not retrieve the value in the first place
m_context << eth::Instruction::POP;
storeInLValue(_assignment);
return false;
@ -123,11 +117,8 @@ bool ExpressionCompiler::visit(BinaryOperation& _binaryOperation)
Type const& commonType = _binaryOperation.getCommonType();
Token::Value const op = _binaryOperation.getOperator();
if (op == Token::AND || op == Token::OR)
{
// special case: short-circuiting
if (op == Token::AND || op == Token::OR) // special case: short-circuiting
appendAndOrOperatorCode(_binaryOperation);
}
else
{
bool cleanupNeeded = false;
@ -135,10 +126,10 @@ bool ExpressionCompiler::visit(BinaryOperation& _binaryOperation)
if (Token::isCompareOp(op) || op == Token::DIV || op == Token::MOD)
cleanupNeeded = true;
leftExpression.accept(*this);
appendTypeConversion(*leftExpression.getType(), commonType, cleanupNeeded);
rightExpression.accept(*this);
appendTypeConversion(*rightExpression.getType(), commonType, cleanupNeeded);
leftExpression.accept(*this);
appendTypeConversion(*leftExpression.getType(), commonType, cleanupNeeded);
if (Token::isCompareOp(op))
appendCompareOperatorCode(op, commonType);
else
@ -175,8 +166,7 @@ bool ExpressionCompiler::visit(FunctionCall& _functionCall)
for (unsigned i = 0; i < arguments.size(); ++i)
{
arguments[i]->accept(*this);
appendTypeConversion(*arguments[i]->getType(),
*function.getParameters()[i]->getType());
appendTypeConversion(*arguments[i]->getType(), *function.getParameters()[i]->getType());
}
m_context.appendJumpTo(m_context.getFunctionEntryLabel(function));
@ -267,23 +257,21 @@ void ExpressionCompiler::appendCompareOperatorCode(Token::Value _operator, Type
IntegerType const& type = dynamic_cast<IntegerType const&>(_type);
bool const isSigned = type.isSigned();
// note that EVM opcodes compare like "stack[0] < stack[1]",
// but our left value is at stack[1], so everyhing is reversed.
switch (_operator)
{
case Token::GTE:
m_context << (isSigned ? eth::Instruction::SGT : eth::Instruction::GT)
<< eth::Instruction::ISZERO;
break;
case Token::LTE:
m_context << (isSigned ? eth::Instruction::SLT : eth::Instruction::LT)
<< eth::Instruction::ISZERO;
break;
case Token::LTE:
m_context << (isSigned ? eth::Instruction::SGT : eth::Instruction::GT)
<< eth::Instruction::ISZERO;
break;
case Token::GT:
m_context << (isSigned ? eth::Instruction::SLT : eth::Instruction::LT);
m_context << (isSigned ? eth::Instruction::SGT : eth::Instruction::GT);
break;
case Token::LT:
m_context << (isSigned ? eth::Instruction::SGT : eth::Instruction::GT);
m_context << (isSigned ? eth::Instruction::SLT : eth::Instruction::LT);
break;
default:
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown comparison operator."));
@ -314,16 +302,16 @@ void ExpressionCompiler::appendArithmeticOperatorCode(Token::Value _operator, Ty
m_context << eth::Instruction::ADD;
break;
case Token::SUB:
m_context << eth::Instruction::SWAP1 << eth::Instruction::SUB;
m_context << eth::Instruction::SUB;
break;
case Token::MUL:
m_context << eth::Instruction::MUL;
break;
case Token::DIV:
m_context << eth::Instruction::SWAP1 << (isSigned ? eth::Instruction::SDIV : eth::Instruction::DIV);
m_context << (isSigned ? eth::Instruction::SDIV : eth::Instruction::DIV);
break;
case Token::MOD:
m_context << eth::Instruction::SWAP1 << (isSigned ? eth::Instruction::SMOD : eth::Instruction::MOD);
m_context << (isSigned ? eth::Instruction::SMOD : eth::Instruction::MOD);
break;
default:
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown arithmetic operator."));
@ -364,10 +352,9 @@ void ExpressionCompiler::appendShiftOperatorCode(Token::Value _operator)
void ExpressionCompiler::appendTypeConversion(Type const& _typeOnStack, Type const& _targetType, bool _cleanupNeeded)
{
// If the type of one of the operands is extended, we need to remove all
// higher-order bits that we might have ignored in previous operations.
// @todo: store in the AST whether the operand might have "dirty" higher
// order bits
// For a type extension, we need to remove all higher-order bits that we might have ignored in
// previous operations.
// @todo: store in the AST whether the operand might have "dirty" higher order bits
if (_typeOnStack == _targetType && !_cleanupNeeded)
return;